Why NumberFormatException thrown at code: DeviceManager.open(7);

Question

I am trying a very basic GPIO pin access program thru Java ME 8.1 (SDK). For this I am creating a custome device thru Custom Device Editor. The configuration of the custom device is as follows (it has only one GPIO pin):
ID: 7, Name: Pin7, H/W Port Number: 0, H/W Pin Number: 7, Direction: Output, Trigger: None, Output: True(checked), Value: Low, Opened: No, Power: On (Group ID: 1)
Here is my MIDLet class to access the GPIO Pin:
package gpio;
import java.io.IOException;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import jdk.dio.DeviceManager;
import jdk.dio.DeviceNotFoundException;
import jdk.dio.UnavailableDeviceException;
import jdk.dio.gpio.GPIOPin;
public class GPIOController extends MIDlet {
    GPIOPin pin7;
    public GPIOController() {
        // TODO Auto-generated constructor stub
    @Override
    protected void destroyApp(boolean unconditional)
            throws MIDletStateChangeException {
        try {
            pin7.close();
        } catch (IOException e) {
            System.out.println("IOException");
            e.printStackTrace();
    @Override
    protected void startApp() throws MIDletStateChangeException {
        try {
            pin7 = DeviceManager.open(7);
            pin7.setValue(true);
            Thread.sleep(5000);
            pin7.setValue(false);
            Thread.sleep(2500);
        } catch (DeviceNotFoundException e) {
            System.out.println("DeviceNotFound Yaar!");
            e.printStackTrace();
        } catch (UnavailableDeviceException e) {
            System.out.println("Yaar Device is Unavailable");
            e.printStackTrace();
        } catch (IOException e) {
            System.out.println("IOException raised");
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NumberFormatException ne){
            System.out.println("number format exception thrown");
            ne.printStackTrace();
Output Console:
number format exception thrown
java.lang.NumberFormatException:
- java/lang/Integer.parseInt(), bci=45
- java/lang/Integer.parseInt(), bci=3
- jdk/dio/DeviceMgmtPermission.implies(), bci=341
- com/oracle/meep/security/PermissionsHash.implies(), bci=57
- com/oracle/meep/security/Permissions.implies(), bci=24
- com/oracle/meep/security/AccessControllerInternal.checkPermission(), bci=28
- java/security/AccessController.checkPermission(), bci=1
- jdk/dio/DeviceManager.open(), bci=169
- jdk/dio/DeviceManager.open(), bci=3
- jdk/dio/DeviceManager.open(), bci=4
- gpio/GPIOController.startApp(GPIOController.java:34)
- javax/microedition/midlet/MIDletTunnelImpl.callStartApp(), bci=1
- com/sun/midp/midlet/MIDletPeer.startApp(), bci=5
- com/sun/midp/midlet/MIDletStateHandler.startSuite(), bci=246
- com/sun/midp/main/AbstractMIDletSuiteLoader.startSuite(), bci=38
- com/sun/midp/main/CldcMIDletSuiteLoader.startSuite(), bci=5
- com/sun/midp/main/AbstractMIDletSuiteLoader.runMIDletSuite(), bci=130
- com/sun/midp/main/AppIsolateMIDletSuiteLoader.main(), bci=26
Device Log
[18:30:23.784]   INFO - lkit.bootstrap.DeployerManager - Registering custom property editors
[18:30:23.808]   INFO - me.toolkit.bootstrap.Namespace - Starting batch, base module object-server
[18:30:23.827]   INFO - bootstrap.ObjectGraphProcessor - Consolidating dependencies...
[18:30:23.828]   INFO - bootstrap.ObjectGraphProcessor - Consolidated dependencies...
[18:30:23.828]   INFO - bootstrap.ObjectGraphProcessor - Calculating order...
[18:30:23.829]   INFO - bootstrap.ObjectGraphProcessor - Calculated order
[18:30:23.857]   INFO - un.jme.toolkit.bootstrap.Batch - Initializing objects...
[18:30:23.858]   INFO - un.jme.toolkit.bootstrap.Batch - Applying I18N
[18:30:23.858]   INFO - un.jme.toolkit.bootstrap.Batch - Initialized objects
[18:30:23.858]   INFO - un.jme.toolkit.bootstrap.Batch - Calling create() methods...
[18:30:23.859]   INFO - un.jme.toolkit.bootstrap.Batch - Calling start() methods...
[18:30:23.867]   INFO - un.jme.toolkit.bootstrap.Batch - Objects started
[18:30:23.871]   INFO - me.toolkit.bootstrap.Namespace - Starting batch, base module devices/GPIOPin
[18:30:26.899]   INFO - bootstrap.ObjectGraphProcessor - Consolidating dependencies...
[18:30:26.900]   INFO - bootstrap.ObjectGraphProcessor - Consolidated dependencies...
[18:30:26.900]   INFO - bootstrap.ObjectGraphProcessor - Calculating order...
[18:30:26.908]   INFO - bootstrap.ObjectGraphProcessor - Calculated order
[18:30:28.097]   INFO - un.jme.toolkit.bootstrap.Batch - Initializing objects...
[18:30:28.504]   INFO - un.jme.toolkit.bootstrap.Batch - Applying I18N
[18:30:28.505]   INFO - un.jme.toolkit.bootstrap.Batch - Initialized objects
[18:30:28.505]   INFO - un.jme.toolkit.bootstrap.Batch - Calling create() methods...
[18:30:28.659]   INFO - un.jme.toolkit.bootstrap.Batch - Calling start() methods...
[18:30:33.628]   INFO - n.kvem.location.LocationBridge - Location dir contents: [Ljava.io.File;@16612a51
[18:30:33.628]   INFO - n.kvem.location.LocationBridge - LandmarkStore names java.util.Collections$EmptyEnumeration@54e041a4
[18:30:33.628]   INFO - n.kvem.location.LocationBridge - Landmark stores:
[18:30:33.629]   INFO - n.kvem.location.LocationBridge - Get categories from store: null
[18:30:33.635]   INFO - n.kvem.location.LocationBridge - Default LandmarkStore:com.sun.kvem.location.LandmarkDB@18317edc
[18:30:33.635]   INFO - n.kvem.location.LocationBridge - LandmarkStore: com.sun.kvem.location.LandmarkDB@18317edc
[18:30:33.635]   INFO - n.kvem.location.LocationBridge - Concatinated categories:
[18:30:33.816]   INFO - .rmiimpl.RemotingConnectorImpl - Starting JMX connector on service:jmx:rmi:///jndi/rmi://127.0.0.1:60379/device-3
[18:30:53.726]   INFO -                      VM-CORE@0 - javanotify_set_vm_args() >>
[18:30:53.727]   INFO -                      VM-CORE@0 - javanotify_start() >>
[18:30:53.762]   INFO - toolkit.ui.actions.AmsExecImpl - Proxy connected. isNetworkMonitorSupported = false
[18:30:54.135]   INFO - un.jme.toolkit.bootstrap.Batch - Objects started
Please let me know what wrong am I doing?
Sincerely,
M. Nawazish. Khan

Answer 1

Hi Nawazish,
you are doing all right. Could you provide example of DeviceMgmtPermission from your application JAD file?
/Sergey